Alex Genkin nik-neg

Discriminated Union Arrays in Prisma Models

Prisma currently does not support union types for fields directly in its schema. For instance, this is not possible:

model Movie {
  id        String @id @default(uuid())
  title     String
  customers (Client | User)[] // <-- Not supported in Prisma

Rough Notes about CQRS and ES

Once upon a time…

I once took notes (almost sentence by sentence with not much editing) about the architectural design concepts - Command and Query Responsibility Segregation (CQRS) and Event Sourcing (ES) - from a presentation of Greg Young and published it as a gist (with the times when a given sentence was heard).

I then found other summaries of the talk and the gist has since been growing up. See the revisions to know the changes and where they came from (aka the sources).

It seems inevitable to throw Domain Driven Design (DDD) in to the mix.

	Key Achievements:

	TH Köln:

	✅ Conducted research in Machine Learning and Deep Learning using Keras, Scikit-Learn, and TensorFlow 2 (2 months after release), leveraging own NVIDIA GPU with 8GB and Google Colab.

	✅ Developed a Deep Learning Toolchain for DNN modeling and evaluation, including preprocessing, CNN modeling with custom layers, multi-architecture training, fine-tuning, evaluation and Deep Feature Extraction with SVM, achieving state-of-the-art performance.

	✅ Deployed a neural network on a mobile device using TensorFlow Lite and Android Studio.

	US Fintech StartUp with R&D in Tel Aviv

	Frontend: React with TS, Redux Toolkit, 𝐑𝐓𝐊𝐐, Styled Components with own Design System
	Backend: NestJS with typeORM, postgreSQL, gRPC, Jest, Redis, PubSub with Pusher, RabbitMQ, Auth0, SQL migrations

	Key Achievements:

	✅ Collaborated in an agile team of ~10 developers, working on B2B & B2B2C applications.

	✅ Developed e2e features in close coordination with Product Managers and UX/UI designers.

	- SaaS StartUp
	- Frontend: React, Next.js, Material UI, Styled Components, TypeScript
	- Backend: NestJS, MongoDB, Mongoose, PostgreSQL, typeORM, Redis, TypeScript, Jest
	- CICD: AWS, GitHub Actions, Docker
	- Data Engineering: Python, Pandas, PostgreSQL, MongoDB, Bash
	- cross-team collaboration (Product, Design, QA)
	- Sprint Planning, Code Reviews, Lessons Learned, and Architecture meetings
	- 2 off-site trips to Paris and Tokyo

	Key Achievements:

	✅ solving a wide range of problems

	✅ Owning end-to-end feature development in a modern microservices architecture using NestJS, Raw SQL, MongoDB aggregations, Redis (Caching & PubSub), TypeORM, Mongoose, React (Hook Form, MobX, Context & Hooks), Next.js, AWS

	✅ Implemented complex data migration ensuring data integrity

	✅ Developed performance-optimized dashboards with pagination using advanced filter, search, and sort logic across multiple entities and schemas

	✅ Created and maintain a responsive flagship npm library (30+ variations) with Web Components using Shadow DOM for script-embed isolation, shipped via GitHub Packages as embeddable script and as React components used on clients websites (20+ US clients) as well as in B2B applications